DIY Solar Powerwalls Build Seven for the Price of One Part 4

[@ericklein5097]

I've been try to convince my dad to snatch up some of these modules but he's not sold on a large system for the house. Only sold him on converting 1 of his Opus pop up camper to lithium after he bought one that already had lithium installed. These modules aren't cheap but really they are a great deal for proper EV grade CATL cells that have just sat on a shelf for a bit.

[@matthewknight5641]

You have put a good amount of work into this battery system but man it freakin rocks. I talk to another guy that does this and hes got a hogh voltage system thats really nice. Those battery packs you bought would be perfect for his system

[@meanttobe100]

Thanks you

[@jiminauburn5073]

This has me thinking seriously about this. Needed about 50kwh, and was looking at those same EG4 batteries. I could get something like this and have even more for a little cheaper.

[@jiminauburn5073]

I wonder if you could have used the last two cells in the back on each side for the 5th battery. Then move the jumper from the back, up a couple of cells. That would allow you to use the existing terminals on each battery. Then you could put terminals in the back of the case, to hook up all the sets of 4 cells into the 5th battery.

[@meanttobe100]

It'll be last 4 but you still have connect them. I just wanted to be able to service each 1 individually. Thanks

[@gubbernl]

Nice series with these videos about this build👍 Although you do take care of the build, it's all a bit tight / serviceable unfriendly? But yeah, that's what it is. I am only a bit worried about nr5. Cable length between parallel packs is essential. David Poz made a specific video about that and eg. Victron does state that also in their build manuals. The reason that batteries should have the same length to the busbar, is that otherwise nr5 will get out of balance. That pack has a lower voltage due to the longer cable length.

[@meanttobe100]

Thank you I was concerned about the same thing but after doing some testing. I haven't noticed any major difference. I'm off by 1% compared to the other 4 packs. That's why I went with 1/0 cable equal lengths to make sure there's no issue with paralleling the 5th pack. I'll keep an eye on it just to make sure it works out. Wires going to inverter is 4/0 Equal length.

[@GTrainRx7]

Generally speaking you can just take the fans off and flip them "backwards". The only issue would be if they were static pressure fans attached to radiators, but in your application it won't matter.

[@patrickmckowen2999]

Looks good - only skipped through, did you do a cost comparison doing packs from scratch vs getting these packs. Cheers

[@meanttobe100]

If you build it from scratch it's about 150-200+ per cell and they mostly from China don't have time to wait and trust Aliexpress/Alababa.

[@Alex300zxTT]

It’s been about a year, how’s it working? Can you do an update video, anything you’d change?

[@MrMinnesota99]

Did you find any dust anywhere in the pack, like leading edge of fan blades or in the air path/cell seperators? Could you do some capacity testing and post data. How well are they staying in balance?

[@meanttobe100]

No dust anywhere. They staying balance pretty good .005mv

[@damanidasilva8530]

Hey. How is the pack performing. Did you do any basic capacity test on your setup.

[@meanttobe100]

It's doing good. I never got around to testing it, but as far as I can tell, it's more than what it's listed.

[@fred8565]

So how is this battery better than the EG4 SERVER RACK Battery?

[@meanttobe100]

It's almost half the cost has 8000 cycles life vs 4000 on EG4 also I know how it's put together.

[@kgsalvage6306]

So are you going to sell the rack that you said you are not using? If so is there anything wrong with it? Why wouldn't you still use it?

[@meanttobe100]

Yes I only make about 60-70kw a day with solar so I don't need more then that. Nothing wrong I just need to clear space so wife can park her car comfortably.

[@stevedutcher3875]

How much you asking for your eg4 batteries?

[@stevedutcher3875]

How did you bend and cut the catl battery post without damaging the post?

[@meanttobe100]

@Steve Dutcher send me email @[e-mail] with ur phone number is your Interested we can chat

[@meanttobe100]

@@stevedutcher3875 drimmel small wheel in middle of 2 post's